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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * Definitions for inet_sock
8 *
9 * Authors: Many, reorganised here by
10 * Arnaldo Carvalho de Melo <acme@mandriva.com>
11 */
12#ifndef _INET_SOCK_H
13#define _INET_SOCK_H
14
15#include <linux/bitops.h>
16#include <linux/string.h>
17#include <linux/types.h>
18#include <linux/jhash.h>
19#include <linux/netdevice.h>
20
21#include <net/flow.h>
22#include <net/sock.h>
23#include <net/request_sock.h>
24#include <net/netns/hash.h>
25#include <net/tcp_states.h>
26#include <net/l3mdev.h>
27
28/** struct ip_options - IP Options
29 *
30 * @faddr - Saved first hop address
31 * @nexthop - Saved nexthop address in LSRR and SSRR
32 * @is_strictroute - Strict source route
33 * @srr_is_hit - Packet destination addr was our one
34 * @is_changed - IP checksum more not valid
35 * @rr_needaddr - Need to record addr of outgoing dev
36 * @ts_needtime - Need to record timestamp
37 * @ts_needaddr - Need to record addr of outgoing dev
38 */
39struct ip_options {
40 __be32 faddr;
41 __be32 nexthop;
42 unsigned char optlen;
43 unsigned char srr;
44 unsigned char rr;
45 unsigned char ts;
46 unsigned char is_strictroute:1,
47 srr_is_hit:1,
48 is_changed:1,
49 rr_needaddr:1,
50 ts_needtime:1,
51 ts_needaddr:1;
52 unsigned char router_alert;
53 unsigned char cipso;
54 unsigned char __pad2;
55 unsigned char __data[];
56};
57
58struct ip_options_rcu {
59 struct rcu_head rcu;
60 struct ip_options opt;
61};
62
63struct ip_options_data {
64 struct ip_options_rcu opt;
65 char data[40];
66};
67
68struct inet_request_sock {
69 struct request_sock req;
70#define ir_loc_addr req.__req_common.skc_rcv_saddr
71#define ir_rmt_addr req.__req_common.skc_daddr
72#define ir_num req.__req_common.skc_num
73#define ir_rmt_port req.__req_common.skc_dport
74#define ir_v6_rmt_addr req.__req_common.skc_v6_daddr
75#define ir_v6_loc_addr req.__req_common.skc_v6_rcv_saddr
76#define ir_iif req.__req_common.skc_bound_dev_if
77#define ir_cookie req.__req_common.skc_cookie
78#define ireq_net req.__req_common.skc_net
79#define ireq_state req.__req_common.skc_state
80#define ireq_family req.__req_common.skc_family
81
82 u16 snd_wscale : 4,
83 rcv_wscale : 4,
84 tstamp_ok : 1,
85 sack_ok : 1,
86 wscale_ok : 1,
87 ecn_ok : 1,
88 acked : 1,
89 no_srccheck: 1,
90 smc_ok : 1;
91 u32 ir_mark;
92 union {
93 struct ip_options_rcu __rcu *ireq_opt;
94#if IS_ENABLED(CONFIG_IPV6)
95 struct {
96 struct ipv6_txoptions *ipv6_opt;
97 struct sk_buff *pktopts;
98 };
99#endif
100 };
101};
102
103static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
104{
105 return (struct inet_request_sock *)sk;
106}
107
108static inline u32 inet_request_mark(const struct sock *sk, struct sk_buff *skb)
109{
110 u32 mark = READ_ONCE(sk->sk_mark);
111
112 if (!mark && READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_fwmark_accept))
113 return skb->mark;
114
115 return mark;
116}
117
118static inline int inet_request_bound_dev_if(const struct sock *sk,
119 struct sk_buff *skb)
120{
121 int bound_dev_if = READ_ONCE(sk->sk_bound_dev_if);
122#ifdef CONFIG_NET_L3_MASTER_DEV
123 struct net *net = sock_net(sk);
124
125 if (!bound_dev_if && READ_ONCE(net->ipv4.sysctl_tcp_l3mdev_accept))
126 return l3mdev_master_ifindex_by_index(net, skb->skb_iif);
127#endif
128
129 return bound_dev_if;
130}
131
132static inline int inet_sk_bound_l3mdev(const struct sock *sk)
133{
134#ifdef CONFIG_NET_L3_MASTER_DEV
135 struct net *net = sock_net(sk);
136
137 if (!READ_ONCE(net->ipv4.sysctl_tcp_l3mdev_accept))
138 return l3mdev_master_ifindex_by_index(net,
139 sk->sk_bound_dev_if);
140#endif
141
142 return 0;
143}
144
145static inline bool inet_bound_dev_eq(bool l3mdev_accept, int bound_dev_if,
146 int dif, int sdif)
147{
148 if (!bound_dev_if)
149 return !sdif || l3mdev_accept;
150 return bound_dev_if == dif || bound_dev_if == sdif;
151}
152
153static inline bool inet_sk_bound_dev_eq(const struct net *net,
154 int bound_dev_if,
155 int dif, int sdif)
156{
157#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
158 return inet_bound_dev_eq(!!READ_ONCE(net->ipv4.sysctl_tcp_l3mdev_accept),
159 bound_dev_if, dif, sdif);
160#else
161 return inet_bound_dev_eq(true, bound_dev_if, dif, sdif);
162#endif
163}
164
165struct inet_cork {
166 unsigned int flags;
167 __be32 addr;
168 struct ip_options *opt;
169 unsigned int fragsize;
170 int length; /* Total length of all frames */
171 struct dst_entry *dst;
172 u8 tx_flags;
173 __u8 ttl;
174 __s16 tos;
175 char priority;
176 __u16 gso_size;
177 u32 ts_opt_id;
178 u64 transmit_time;
179 u32 mark;
180};
181
182struct inet_cork_full {
183 struct inet_cork base;
184 struct flowi fl;
185};
186
187struct ip_mc_socklist;
188struct ipv6_pinfo;
189struct rtable;
190
191/** struct inet_sock - representation of INET sockets
192 *
193 * @sk - ancestor class
194 * @pinet6 - pointer to IPv6 control block
195 * @inet_daddr - Foreign IPv4 addr
196 * @inet_rcv_saddr - Bound local IPv4 addr
197 * @inet_dport - Destination port
198 * @inet_num - Local port
199 * @inet_flags - various atomic flags
200 * @inet_saddr - Sending source
201 * @uc_ttl - Unicast TTL
202 * @inet_sport - Source port
203 * @inet_id - ID counter for DF pkts
204 * @tos - TOS
205 * @mc_ttl - Multicasting TTL
206 * @uc_index - Unicast outgoing device index
207 * @mc_index - Multicast device index
208 * @mc_list - Group array
209 * @cork - info to build ip hdr on each ip frag while socket is corked
210 */
211struct inet_sock {
212 /* sk and pinet6 has to be the first two members of inet_sock */
213 struct sock sk;
214#if IS_ENABLED(CONFIG_IPV6)
215 struct ipv6_pinfo *pinet6;
216#endif
217 /* Socket demultiplex comparisons on incoming packets. */
218#define inet_daddr sk.__sk_common.skc_daddr
219#define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr
220#define inet_dport sk.__sk_common.skc_dport
221#define inet_num sk.__sk_common.skc_num
222
223 unsigned long inet_flags;
224 __be32 inet_saddr;
225 __s16 uc_ttl;
226 __be16 inet_sport;
227 struct ip_options_rcu __rcu *inet_opt;
228 atomic_t inet_id;
229
230 __u8 tos;
231 __u8 min_ttl;
232 __u8 mc_ttl;
233 __u8 pmtudisc;
234 __u8 rcv_tos;
235 __u8 convert_csum;
236 int uc_index;
237 int mc_index;
238 __be32 mc_addr;
239 u32 local_port_range; /* high << 16 | low */
240
241 struct ip_mc_socklist __rcu *mc_list;
242 struct inet_cork_full cork;
243};
244
245#define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
246#define IPCORK_TS_OPT_ID 2 /* ts_opt_id field is valid, overriding sk_tskey */
247
248enum {
249 INET_FLAGS_PKTINFO = 0,
250 INET_FLAGS_TTL = 1,
251 INET_FLAGS_TOS = 2,
252 INET_FLAGS_RECVOPTS = 3,
253 INET_FLAGS_RETOPTS = 4,
254 INET_FLAGS_PASSSEC = 5,
255 INET_FLAGS_ORIGDSTADDR = 6,
256 INET_FLAGS_CHECKSUM = 7,
257 INET_FLAGS_RECVFRAGSIZE = 8,
258
259 INET_FLAGS_RECVERR = 9,
260 INET_FLAGS_RECVERR_RFC4884 = 10,
261 INET_FLAGS_FREEBIND = 11,
262 INET_FLAGS_HDRINCL = 12,
263 INET_FLAGS_MC_LOOP = 13,
264 INET_FLAGS_MC_ALL = 14,
265 INET_FLAGS_TRANSPARENT = 15,
266 INET_FLAGS_IS_ICSK = 16,
267 INET_FLAGS_NODEFRAG = 17,
268 INET_FLAGS_BIND_ADDRESS_NO_PORT = 18,
269 INET_FLAGS_DEFER_CONNECT = 19,
270 INET_FLAGS_MC6_LOOP = 20,
271 INET_FLAGS_RECVERR6_RFC4884 = 21,
272 INET_FLAGS_MC6_ALL = 22,
273 INET_FLAGS_AUTOFLOWLABEL_SET = 23,
274 INET_FLAGS_AUTOFLOWLABEL = 24,
275 INET_FLAGS_DONTFRAG = 25,
276 INET_FLAGS_RECVERR6 = 26,
277 INET_FLAGS_REPFLOW = 27,
278 INET_FLAGS_RTALERT_ISOLATE = 28,
279 INET_FLAGS_SNDFLOW = 29,
280 INET_FLAGS_RTALERT = 30,
281};
282
283/* cmsg flags for inet */
284#define IP_CMSG_PKTINFO BIT(INET_FLAGS_PKTINFO)
285#define IP_CMSG_TTL BIT(INET_FLAGS_TTL)
286#define IP_CMSG_TOS BIT(INET_FLAGS_TOS)
287#define IP_CMSG_RECVOPTS BIT(INET_FLAGS_RECVOPTS)
288#define IP_CMSG_RETOPTS BIT(INET_FLAGS_RETOPTS)
289#define IP_CMSG_PASSSEC BIT(INET_FLAGS_PASSSEC)
290#define IP_CMSG_ORIGDSTADDR BIT(INET_FLAGS_ORIGDSTADDR)
291#define IP_CMSG_CHECKSUM BIT(INET_FLAGS_CHECKSUM)
292#define IP_CMSG_RECVFRAGSIZE BIT(INET_FLAGS_RECVFRAGSIZE)
293
294#define IP_CMSG_ALL (IP_CMSG_PKTINFO | IP_CMSG_TTL | \
295 IP_CMSG_TOS | IP_CMSG_RECVOPTS | \
296 IP_CMSG_RETOPTS | IP_CMSG_PASSSEC | \
297 IP_CMSG_ORIGDSTADDR | IP_CMSG_CHECKSUM | \
298 IP_CMSG_RECVFRAGSIZE)
299
300static inline unsigned long inet_cmsg_flags(const struct inet_sock *inet)
301{
302 return READ_ONCE(inet->inet_flags) & IP_CMSG_ALL;
303}
304
305#define inet_test_bit(nr, sk) \
306 test_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags)
307#define inet_set_bit(nr, sk) \
308 set_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags)
309#define inet_clear_bit(nr, sk) \
310 clear_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags)
311#define inet_assign_bit(nr, sk, val) \
312 assign_bit(INET_FLAGS_##nr, &inet_sk(sk)->inet_flags, val)
313
314/**
315 * sk_to_full_sk - Access to a full socket
316 * @sk: pointer to a socket
317 *
318 * SYNACK messages might be attached to request sockets.
319 * Some places want to reach the listener in this case.
320 */
321static inline struct sock *sk_to_full_sk(struct sock *sk)
322{
323#ifdef CONFIG_INET
324 if (sk && READ_ONCE(sk->sk_state) == TCP_NEW_SYN_RECV)
325 sk = inet_reqsk(sk)->rsk_listener;
326 if (sk && READ_ONCE(sk->sk_state) == TCP_TIME_WAIT)
327 sk = NULL;
328#endif
329 return sk;
330}
331
332/* sk_to_full_sk() variant with a const argument */
333static inline const struct sock *sk_const_to_full_sk(const struct sock *sk)
334{
335#ifdef CONFIG_INET
336 if (sk && READ_ONCE(sk->sk_state) == TCP_NEW_SYN_RECV)
337 sk = ((const struct request_sock *)sk)->rsk_listener;
338 if (sk && READ_ONCE(sk->sk_state) == TCP_TIME_WAIT)
339 sk = NULL;
340#endif
341 return sk;
342}
343
344static inline struct sock *skb_to_full_sk(const struct sk_buff *skb)
345{
346 return sk_to_full_sk(skb->sk);
347}
348
349#define inet_sk(ptr) container_of_const(ptr, struct inet_sock, sk)
350
351static inline void __inet_sk_copy_descendant(struct sock *sk_to,
352 const struct sock *sk_from,
353 const int ancestor_size)
354{
355 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
356 sk_from->sk_prot->obj_size - ancestor_size);
357}
358
359int inet_sk_rebuild_header(struct sock *sk);
360
361/**
362 * inet_sk_state_load - read sk->sk_state for lockless contexts
363 * @sk: socket pointer
364 *
365 * Paired with inet_sk_state_store(). Used in places we don't hold socket lock:
366 * tcp_diag_get_info(), tcp_get_info(), tcp_poll(), get_tcp4_sock() ...
367 */
368static inline int inet_sk_state_load(const struct sock *sk)
369{
370 /* state change might impact lockless readers. */
371 return smp_load_acquire(&sk->sk_state);
372}
373
374/**
375 * inet_sk_state_store - update sk->sk_state
376 * @sk: socket pointer
377 * @newstate: new state
378 *
379 * Paired with inet_sk_state_load(). Should be used in contexts where
380 * state change might impact lockless readers.
381 */
382void inet_sk_state_store(struct sock *sk, int newstate);
383
384void inet_sk_set_state(struct sock *sk, int state);
385
386static inline unsigned int __inet_ehashfn(const __be32 laddr,
387 const __u16 lport,
388 const __be32 faddr,
389 const __be16 fport,
390 u32 initval)
391{
392 return jhash_3words((__force __u32) laddr,
393 (__force __u32) faddr,
394 ((__u32) lport) << 16 | (__force __u32)fport,
395 initval);
396}
397
398struct request_sock *inet_reqsk_alloc(const struct request_sock_ops *ops,
399 struct sock *sk_listener,
400 bool attach_listener);
401
402static inline __u8 inet_sk_flowi_flags(const struct sock *sk)
403{
404 __u8 flags = 0;
405
406 if (inet_test_bit(TRANSPARENT, sk) || inet_test_bit(HDRINCL, sk))
407 flags |= FLOWI_FLAG_ANYSRC;
408 return flags;
409}
410
411static inline void inet_inc_convert_csum(struct sock *sk)
412{
413 inet_sk(sk)->convert_csum++;
414}
415
416static inline void inet_dec_convert_csum(struct sock *sk)
417{
418 if (inet_sk(sk)->convert_csum > 0)
419 inet_sk(sk)->convert_csum--;
420}
421
422static inline bool inet_get_convert_csum(struct sock *sk)
423{
424 return !!inet_sk(sk)->convert_csum;
425}
426
427
428static inline bool inet_can_nonlocal_bind(struct net *net,
429 struct inet_sock *inet)
430{
431 return READ_ONCE(net->ipv4.sysctl_ip_nonlocal_bind) ||
432 test_bit(INET_FLAGS_FREEBIND, &inet->inet_flags) ||
433 test_bit(INET_FLAGS_TRANSPARENT, &inet->inet_flags);
434}
435
436static inline bool inet_addr_valid_or_nonlocal(struct net *net,
437 struct inet_sock *inet,
438 __be32 addr,
439 int addr_type)
440{
441 return inet_can_nonlocal_bind(net, inet) ||
442 addr == htonl(INADDR_ANY) ||
443 addr_type == RTN_LOCAL ||
444 addr_type == RTN_MULTICAST ||
445 addr_type == RTN_BROADCAST;
446}
447
448#endif /* _INET_SOCK_H */
1/*
2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * Definitions for inet_sock
7 *
8 * Authors: Many, reorganised here by
9 * Arnaldo Carvalho de Melo <acme@mandriva.com>
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 */
16#ifndef _INET_SOCK_H
17#define _INET_SOCK_H
18
19#include <linux/bitops.h>
20#include <linux/kmemcheck.h>
21#include <linux/string.h>
22#include <linux/types.h>
23#include <linux/jhash.h>
24#include <linux/netdevice.h>
25
26#include <net/flow.h>
27#include <net/sock.h>
28#include <net/request_sock.h>
29#include <net/netns/hash.h>
30#include <net/tcp_states.h>
31#include <net/l3mdev.h>
32
33/** struct ip_options - IP Options
34 *
35 * @faddr - Saved first hop address
36 * @nexthop - Saved nexthop address in LSRR and SSRR
37 * @is_strictroute - Strict source route
38 * @srr_is_hit - Packet destination addr was our one
39 * @is_changed - IP checksum more not valid
40 * @rr_needaddr - Need to record addr of outgoing dev
41 * @ts_needtime - Need to record timestamp
42 * @ts_needaddr - Need to record addr of outgoing dev
43 */
44struct ip_options {
45 __be32 faddr;
46 __be32 nexthop;
47 unsigned char optlen;
48 unsigned char srr;
49 unsigned char rr;
50 unsigned char ts;
51 unsigned char is_strictroute:1,
52 srr_is_hit:1,
53 is_changed:1,
54 rr_needaddr:1,
55 ts_needtime:1,
56 ts_needaddr:1;
57 unsigned char router_alert;
58 unsigned char cipso;
59 unsigned char __pad2;
60 unsigned char __data[0];
61};
62
63struct ip_options_rcu {
64 struct rcu_head rcu;
65 struct ip_options opt;
66};
67
68struct ip_options_data {
69 struct ip_options_rcu opt;
70 char data[40];
71};
72
73struct inet_request_sock {
74 struct request_sock req;
75#define ir_loc_addr req.__req_common.skc_rcv_saddr
76#define ir_rmt_addr req.__req_common.skc_daddr
77#define ir_num req.__req_common.skc_num
78#define ir_rmt_port req.__req_common.skc_dport
79#define ir_v6_rmt_addr req.__req_common.skc_v6_daddr
80#define ir_v6_loc_addr req.__req_common.skc_v6_rcv_saddr
81#define ir_iif req.__req_common.skc_bound_dev_if
82#define ir_cookie req.__req_common.skc_cookie
83#define ireq_net req.__req_common.skc_net
84#define ireq_state req.__req_common.skc_state
85#define ireq_family req.__req_common.skc_family
86
87 kmemcheck_bitfield_begin(flags);
88 u16 snd_wscale : 4,
89 rcv_wscale : 4,
90 tstamp_ok : 1,
91 sack_ok : 1,
92 wscale_ok : 1,
93 ecn_ok : 1,
94 acked : 1,
95 no_srccheck: 1;
96 kmemcheck_bitfield_end(flags);
97 u32 ir_mark;
98 union {
99 struct ip_options_rcu *opt;
100 struct sk_buff *pktopts;
101 };
102};
103
104static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
105{
106 return (struct inet_request_sock *)sk;
107}
108
109static inline u32 inet_request_mark(const struct sock *sk, struct sk_buff *skb)
110{
111 if (!sk->sk_mark && sock_net(sk)->ipv4.sysctl_tcp_fwmark_accept)
112 return skb->mark;
113
114 return sk->sk_mark;
115}
116
117static inline int inet_request_bound_dev_if(const struct sock *sk,
118 struct sk_buff *skb)
119{
120#ifdef CONFIG_NET_L3_MASTER_DEV
121 struct net *net = sock_net(sk);
122
123 if (!sk->sk_bound_dev_if && net->ipv4.sysctl_tcp_l3mdev_accept)
124 return l3mdev_master_ifindex_by_index(net, skb->skb_iif);
125#endif
126
127 return sk->sk_bound_dev_if;
128}
129
130struct inet_cork {
131 unsigned int flags;
132 __be32 addr;
133 struct ip_options *opt;
134 unsigned int fragsize;
135 int length; /* Total length of all frames */
136 struct dst_entry *dst;
137 u8 tx_flags;
138 __u8 ttl;
139 __s16 tos;
140 char priority;
141};
142
143struct inet_cork_full {
144 struct inet_cork base;
145 struct flowi fl;
146};
147
148struct ip_mc_socklist;
149struct ipv6_pinfo;
150struct rtable;
151
152/** struct inet_sock - representation of INET sockets
153 *
154 * @sk - ancestor class
155 * @pinet6 - pointer to IPv6 control block
156 * @inet_daddr - Foreign IPv4 addr
157 * @inet_rcv_saddr - Bound local IPv4 addr
158 * @inet_dport - Destination port
159 * @inet_num - Local port
160 * @inet_saddr - Sending source
161 * @uc_ttl - Unicast TTL
162 * @inet_sport - Source port
163 * @inet_id - ID counter for DF pkts
164 * @tos - TOS
165 * @mc_ttl - Multicasting TTL
166 * @is_icsk - is this an inet_connection_sock?
167 * @uc_index - Unicast outgoing device index
168 * @mc_index - Multicast device index
169 * @mc_list - Group array
170 * @cork - info to build ip hdr on each ip frag while socket is corked
171 */
172struct inet_sock {
173 /* sk and pinet6 has to be the first two members of inet_sock */
174 struct sock sk;
175#if IS_ENABLED(CONFIG_IPV6)
176 struct ipv6_pinfo *pinet6;
177#endif
178 /* Socket demultiplex comparisons on incoming packets. */
179#define inet_daddr sk.__sk_common.skc_daddr
180#define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr
181#define inet_dport sk.__sk_common.skc_dport
182#define inet_num sk.__sk_common.skc_num
183
184 __be32 inet_saddr;
185 __s16 uc_ttl;
186 __u16 cmsg_flags;
187 __be16 inet_sport;
188 __u16 inet_id;
189
190 struct ip_options_rcu __rcu *inet_opt;
191 int rx_dst_ifindex;
192 __u8 tos;
193 __u8 min_ttl;
194 __u8 mc_ttl;
195 __u8 pmtudisc;
196 __u8 recverr:1,
197 is_icsk:1,
198 freebind:1,
199 hdrincl:1,
200 mc_loop:1,
201 transparent:1,
202 mc_all:1,
203 nodefrag:1;
204 __u8 bind_address_no_port:1;
205 __u8 rcv_tos;
206 __u8 convert_csum;
207 int uc_index;
208 int mc_index;
209 __be32 mc_addr;
210 struct ip_mc_socklist __rcu *mc_list;
211 struct inet_cork_full cork;
212};
213
214#define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
215#define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */
216
217/* cmsg flags for inet */
218#define IP_CMSG_PKTINFO BIT(0)
219#define IP_CMSG_TTL BIT(1)
220#define IP_CMSG_TOS BIT(2)
221#define IP_CMSG_RECVOPTS BIT(3)
222#define IP_CMSG_RETOPTS BIT(4)
223#define IP_CMSG_PASSSEC BIT(5)
224#define IP_CMSG_ORIGDSTADDR BIT(6)
225#define IP_CMSG_CHECKSUM BIT(7)
226
227/**
228 * sk_to_full_sk - Access to a full socket
229 * @sk: pointer to a socket
230 *
231 * SYNACK messages might be attached to request sockets.
232 * Some places want to reach the listener in this case.
233 */
234static inline struct sock *sk_to_full_sk(struct sock *sk)
235{
236#ifdef CONFIG_INET
237 if (sk && sk->sk_state == TCP_NEW_SYN_RECV)
238 sk = inet_reqsk(sk)->rsk_listener;
239#endif
240 return sk;
241}
242
243/* sk_to_full_sk() variant with a const argument */
244static inline const struct sock *sk_const_to_full_sk(const struct sock *sk)
245{
246#ifdef CONFIG_INET
247 if (sk && sk->sk_state == TCP_NEW_SYN_RECV)
248 sk = ((const struct request_sock *)sk)->rsk_listener;
249#endif
250 return sk;
251}
252
253static inline struct sock *skb_to_full_sk(const struct sk_buff *skb)
254{
255 return sk_to_full_sk(skb->sk);
256}
257
258static inline struct inet_sock *inet_sk(const struct sock *sk)
259{
260 return (struct inet_sock *)sk;
261}
262
263static inline void __inet_sk_copy_descendant(struct sock *sk_to,
264 const struct sock *sk_from,
265 const int ancestor_size)
266{
267 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
268 sk_from->sk_prot->obj_size - ancestor_size);
269}
270#if !(IS_ENABLED(CONFIG_IPV6))
271static inline void inet_sk_copy_descendant(struct sock *sk_to,
272 const struct sock *sk_from)
273{
274 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
275}
276#endif
277
278int inet_sk_rebuild_header(struct sock *sk);
279
280static inline unsigned int __inet_ehashfn(const __be32 laddr,
281 const __u16 lport,
282 const __be32 faddr,
283 const __be16 fport,
284 u32 initval)
285{
286 return jhash_3words((__force __u32) laddr,
287 (__force __u32) faddr,
288 ((__u32) lport) << 16 | (__force __u32)fport,
289 initval);
290}
291
292struct request_sock *inet_reqsk_alloc(const struct request_sock_ops *ops,
293 struct sock *sk_listener,
294 bool attach_listener);
295
296static inline __u8 inet_sk_flowi_flags(const struct sock *sk)
297{
298 __u8 flags = 0;
299
300 if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl)
301 flags |= FLOWI_FLAG_ANYSRC;
302 return flags;
303}
304
305static inline void inet_inc_convert_csum(struct sock *sk)
306{
307 inet_sk(sk)->convert_csum++;
308}
309
310static inline void inet_dec_convert_csum(struct sock *sk)
311{
312 if (inet_sk(sk)->convert_csum > 0)
313 inet_sk(sk)->convert_csum--;
314}
315
316static inline bool inet_get_convert_csum(struct sock *sk)
317{
318 return !!inet_sk(sk)->convert_csum;
319}
320
321#endif /* _INET_SOCK_H */